"If it goes through without any changes, it will make the privatisation of services like the NHS irreversible.”

£100bn

Once finalised, the deal will remove tariffs and make it easier for firms to invest in markets and services on either side of the Atlantic.

The Government says it will be worth £100billion a year to the EU and £80billion to the US.

But campaigners say one crucial clause means firms could sue Britain if the Government tries to bring services back into public ownership.

“Big corporations will be able to sue our government if they make changes to the law which affect businesses’ profits,” Mr Morris said.

Concern: Lord Livingston tried to downplay the impact on the NHS (Photo: Getty)

Lord Livingston tried to downplay the impact on the NHS, saying: “There’s absolutely no need to exclude the NHS, because it will not be impacted.”

He said he wanted the NHS included in the deal so that Britain could sell healthcare services in the US.

But unions said it was clear the Tories were not interested in protecting the NHS.

Len McCluskey, Unite general secretary, blasted: “The people of this country didn’t vote for selling-off our NHS, and they didn’t vote to make the sell-off irreversible by giving US companies the right to sue us in secret courts.”

One in three people are still unaware of a new NHS phone service, 18 months after it was launched.

NHS boss Simon Stevens said there was “more work to be done” in raising awareness of the 111 service.